Frontier Airlines PHX Terminal refers to the terminal used by Frontier Airlines at Phoenix Sky Harbor International Airport (PHX). Frontier Airlines typically operates out of Terminal 3 at PHX, where passengers can check in, go through security, and board their flights. It’s always a good idea to double-check the terminal information for your specific flight, as assignments can change... https://airlineofficedetails.com/frontier-airlines-phoenix-airport-terminal-phx/